Required upgrade for any M03/M04, M05/M06 chassis. The stock friction dampers are no match for these alluminum upgrades. They have threaded adjustment and are super smooth made entirely of alluminum bodies. The blue and black color is very nice too, which can complement any m chassis. These are great for on-road and rally use - they are very durable and will last a lifetime if properly maintained and cleaned. Would highly reccommend this product as a necessity to any M-Chassis owners.